Disabled accounts due to mail server connection issues are considered as inactive

As an example, @smaug---- had an issue in his mail server which got his Bugzilla account to be disabled: https://mozilla.slack.com/archives/C5F7KFJ4R/p1658153225222019.
As an effect, autonag considered him as inactive: https://bugzilla.mozilla.org/show_bug.cgi?id=1779206#c8

Account disabling messages:

Your Bugzilla account has been disabled due to issues delivering emails to your address.

Your mail server said: (failed) Amazon SES has suppressed sending to this address because it has a recent history of bouncing as an invalid address. For more information about how to remove an address from the suppression list, see the Amazon SES Developer Guide: http://docs.aws.amazon.com/ses/latest/DeveloperGuide/remove-from-suppressionlist.html

Your Bugzilla account has been disabled due to issues delivering emails to your address.

Your mail server said: (failed) smtp; 553 5.1.2 Unknown mail server. Could not find a mail server for pettay.fi

No source file or test is named. Start by locating the code that handles email-disabled Bugzilla accounts and the autonag inactive classification, then compare it with the examples in this issue. Done means accounts disabled because of mail delivery failures are not incorrectly treated as inactive.